International Workshop on Accelerator Alignment 2010

13 Sept 2010, 08:00 → 17 Sept 2010, 14:30 Europe/Berlin

Deutsches Elektronen-Synchrotron

The eleventh International Workshop on Accelerator Alignment 2010 (IWAA 2010) will take place at DESY, Germany.

Monday 13 September

registration

Lunch Time

Welcome address and introduction

Day_1, Session_1, Survey & alignment of machine components & experiments

1 The alignment of the LHC during the long shut-down 2008-2009

The first run of the LHC took place in September 2008 and was stopped brutally after only 2 weeks due to an incident provoked by an electrical short circuit in an interconnection betwen two magnets. A shut down of one year was decided in order to repare the damaged equipment and the Survey team took advantage of this period to verify and improve the alignment of the components by measuring and smoothing their position in the arcs as well as in the Long Straight Sections (LSS). This paper will cover the different operations accomplished and the results obtained.

Speaker: Mr Dominique Missiaen (CERN)

2 Survey of KEKB magnets and monuments for SuperKEKB

A survey of the KEKB magnets and monuments was carried out using FARO laser trackers and LEICA DNA03 to form a survey network for the next-generation B-factory, SuperKEKB. All of the main dipole magnets in the low energy ring (LER) will be replaced by longer magnets and the magnets in the entire interaction region as well as in the straight sections on either side of the interaction region will be replaced. A strategy to complete the installation and the alignment of the magnets will be discussed.

Speaker: Dr Mika Masuzawa (KEK)

Paper masuzawasurvey.docx masuzawasurvey.pdf

3 Comparision and Study in Measurement Accuracy of height Difference between laser tracker and level

On the basis of data which we measured in the last few years in BEPCII tunnel, we compare and study in measurement accuracy of height difference between laser tracker and level. Compare error of laser tracker in single station and level is 0.087mm. The results show that the accuracy of laser tracker measuring vertical network in single station meets the requirement of accelerator physics. the accelerator vertical measurement ,laser tracker can instead of level certainly.

Speaker: Mrs Lingling men (Institute of High Energy Physics)

4 The Initial Geodetic Survey for the SPIRAL2 Process Installation

The SPIRAL2 project located at the Grand Accélérateur National d’Ions Lourds (GANIL facility - Caen, France) has been studied since the beginning of 2001, and is now under construction. This project aims at delivering rare (radioactive) isotope beams with intensities not yet available with presently running machines. An important aspect of this project is that it is foreseen to deliver up to five different beams in parallel to the users. This paper is focused mainly on the initial geodetic survey for the SPIRAL2 process installation. The positioning of the process and by extension of the buildings is subject to an important constraint due to the future connection of the radioactive beam line to the existing accelerator. In order to reach the performances, a geodetic reference network (surface network) linked to the local survey network of the existing accelerator is designed. The surface network will be transferred to the floor of the SPIRAL2 accelerator tunnel, in order to define the underground reference network for the process setup. Final goal of the initial geodetic survey is to align process components of accelerator according to design within required tolerance.

Speaker: Mr Rémy BEUNARD (GANIL - CEA/DSM-CNRS/IN2P3)

15:10 coffee break

Day_1, Session_2, Survey & alignment of machine components & experiments

5 Installation and Alignment of RIKEN-XFEL at SPring-8

The RIKEN-JASRI Joint XFEL Project Team is constructing XFEL facility at SPring-8 site. The building with a total length of 640m was completed in March, 2009. Install of the accelerator components was started from March 2009. Now, the accelerator section is almost finished and the undulator section is 40% finished. Its operation will be started from February 2011. We will present installation and alignment work on the whole, including a strategy of alignment, displacement of the floor concrete in this year, dealing with the subsidence of the floor concrete.

Speaker: Dr Hiroaki KIMURA (Riken/SPring-8)

6 CLIC active pre-alignment system: proposal for CDR and program for TDR

The active pre-alignment of the Compact LInear Collider (CLIC) is one of the key points of the project: its feasibility will have to be demonstrated in the Conceptual Design Report (CDR), end of 2010. The components must be pre-aligned with respect to a straight line within a few microns over a sliding window of 200 m, along the whole 20 km long linacs. The proposed solution is the outcome of 20 years of Research and Development (R&D). Stretched wires of more than 200 m, overlapping over half of their length, will be the reference of alignment. WPS sensors, coupled to the compoments to be pre-aligned, will perform precise and accurate measurements with respect to these wires. In this paper, the global strategy of active pre-alignment is detailed, taking into account both the determination of the position and the repositioning. This presentation will be completed by results demonstrating the feasibility of the proposed solution. The validation of such a solution will be confirmed on real size mock-ups, in lab and in accelerator environment. These tests, foreseen during the Technical Design (TDR) phase, will be completed by additional R&D on alternative alignment and repositioning solutions.

Speaker: Dr Helene MAINAUD DURAND (CERN)

7 Survey of the NOvA Near Detector at Fermilab

The primary goal of the NOvA experiment at Fermilab is to search for evidence of muon to electron neutrino oscillations. NOvA will use two detectors, the near detector located underground at Fermilab in the NuMI tunnels and the far detector located 810 km from Fermilab on the US-Canada border in Ash River, Minnesota. This paper discusses the survey of the NOvA near detector.

Speaker: Dr Babatunde Oshinowo (Fermilab)

8 Overview of the Preliminary Geodetic and Alignment Concepts for the LBNE Project

In the context of today’s global interest in the neutrino research programs, with special emphasis on long baseline neutrino oscillation experiments, the LBNE project at Fermilab receives special attention as the world's highest-intensity neutrino beam to be sent more than 1,200 kilometres straight through the earth to the largest particle detectors ever built deep underground in South Dakota’s DUSEL laboratory. This paper presents an overview of the concepts and the proposed methodology to implement the geodetic and industrial alignment procedures to support the construction, installation, and alignment of the LBNE particle beam line and the DUSEL detectors.

Speaker: Dr Virgil Bocean (Fermilab)

17:00 Icebreaker party

Tuesday 14 September

D2, S1, Survey & alignment of machine components & experiments

9 Alignment Measurement for Daya Bay Reactor Neutrino Detector

It’s the prophase research for neutrino oscillation that daya bay reactor neutrino experiment，and the main emphasis is on measuring a physical significance of parameters –the mixing angle . The Alignment measurement for distance between the reactor of the Daya Bay Nuclear and Neutrino Detector，is divided into total-station Surveying inside tunnel and GPS Surveying outside。This paper have a several of researches and experiments about accelerator’s alignment measurement in large-scale space to get the useful conclusions and methods，integral to the questions of large surveying area、high precision、connecting the internal and external coordinate systems、as well as three-dimensional distance measurement.

Speaker: tao luo (Institute of High ENergy Physics,Chinese Academy of Sciences)

10 First Experience utilizing a High-Density Laser Scanner for the NoVA project

The NuMI Off-Axis νe Appearance Experiment (NOvA) project is currently in its construction phase and estimated to be operational around 2015. This experiment is an extension of the Neutrino at Main Injector (NuMI) project that has been operational for several years now. For NuMI a Neutrino beam is produced at Fermilab and directed to a detector located underground at the Soudan Mine in Minnesota. For NOvA a near and far detector need to be placed at a divergence angle of 13.6 mrad of nominal NuMI beam center line for the detection of Neutrinos at a different energy state. These detectors are constructed from plastic extrusions filled with silicon oil. This paper concentrates on the construction of the larger far detector, its dimensional tolerance requirements and the measurement approach utilizing the HDS6100 scanner for documenting the parts location during the detector construction.

Speaker: Mr Horst Friedsam (Fermi National Laboratory)

11 Permanent monitoring of the LHC low beta triplets: latest results and perspectives

Since 2008, alignment systems are installed on all LHC low beta triplets. These systems allow the monitoring of the triplets with a micrometric precision through the different phases of installation, commissioning and operation. After a short reminder concerning the configuration of sensors on the triplets, this paper deals with significant results of monitoring on short and long term periods. First conclusions are drawn concerning these alignment systems, their associated mechanical supports and acquisition solutions. As an outlook, the modifications foreseen for the consolidation phase are presented.

Speaker: Dr Helene MAINAUD DURAND (CERN)

12 Beam Based Alignment of High Intensity Gamma Source (HIGS) targets at Duke University Free Electron Laser Lab

In order to rapidly and precisely align and image objects and other experimental targets which are placed in the path of gamma rays, a gamma ray imaging system was designed, fabricated and successfully utilized. Major components of this system consist of a scintillation crystal plate, and a CCD camera. A spatial resolution of a 0.5 mm was achieved with this system. In this article, detail design and applications of this system will be reviewed and analyzed.

Speaker: Mr Mark Emamian (Duke Free Electron Laser Lab)

10:20 Coffee Break

D2, S2, Instrumentation, software and methods

13 INTERCOMPARISON TESTS WITH HLS AND WPS

Since the 1990s, hydrostatic levelling sensors (HLS) and wire position sensors (WPS) are used for monitoring applications in the accelerator alignment. The sensors are at different levels of development, ranging from prototype to off-the-shelf sensors, and use different technologies to achieve µm resolution. Both, the Compact Linear Collider (CLIC) project as well as the International Linear Collider (ILC) project, are based on alignment concepts that can use such systems. The idea of an intercomparison between different types of HLS sensors and different types of WPS sensors was the basis for the CLIC pre-alignment workshop which was held at CERN in 2009. An overview on HLS and WPS based alignment systems used in different institutes was given and in conclusion the participating institutes agreed on a sensor intercomparison programme. The aims of these tests are outlined in this paper, the sensors and the comparison test installations described and results of the first intercomparison measurements are shown.

Speaker: Mr Andreas Herty (CERN)

Paper IWAA2010_herty_paper.pdf

Slides IWAA2010_herty_presentation.pdf

14 THE COLLIMATOR SURVEY TRAIN

Prompt radiation created during the beam cleaning process of the LHC will lead to highly activated beam line components in the cleaning insertions. The ALARA principle (As Low As Reasonable Achievable) is restricting the intervention time in these areas to an absolute minimum and conventional alignment methods will clearly exceed the limits. Based on the inspection train TIM (Train Inspection Monorail) the survey section has developed a dedicated train module allowing remote controlled alignment measurements of the radioactive components by means of digital close range photogrammetry and stretched wire measurements. The prototype is completed and the tests in the LHC mock-up are showing the first results. This paper will focus on the concept, development and the first results of this remote measurement system.

Speaker: Mr Patrick Bestmann (CERN)

15 Straight Line Reference System, the poisson line versus classical alignment laser.

The Poisson line versus classical alignment laser.

Speaker: Mr Christian Schwalm (DESY)

16 Vendor Presentation, R. Kinzel, GDV Systems

GDV Systems

17 The European XFEL Project, an Introduction.

Speaker: Dr Frank Poppe (European XFEL GmbH)

12:30 lunch

D2, afternoon, DESY and European XFEL tour, Bus transfers

Wednesday 15 September

D3, S1, Vendor Presentation

18 Steffen Lindemann, API

19 Dr. C.-Th. Schneider, AICON, Move Inspect Technology

20 Joel Martin, Leica: Technology behind the new AT401

Joel Martin, Technology behind the new AT401

10:20 coffee break

D3, S2, Tutorial Session

21 Lecture on error theory

Speaker: Prof. Wolfgang Niemeier (TU Braunschweig, Institut für Geodäsie und Photogrammetrie)

22 'hands on' Demo, error theory

12:30 lunch

D3, S3, Tutorial Session

23 Lecture on adjustment theory

Speaker: Prof. Wolfgang Niemeier (TU Braunschweig, Institut für Geodäsie und Photogrammetrie)

24 'hands on' Demo, adjustment theory

15:30 Coffee Break

D3, S4, Invited Talk, Discussion

25 The geodetic calibration line of the UniBw Munich – Conception and implementation.

Speaker: Prof. Otto Heunecke (UNI BW München)

Slides Invited_talk_on_calibration_at_IWAA_2010_HEUNECKE.pdf

26 time for discussion, 16.30 - 17.00

Banquet, Port of Hamburg

Thursday 16 September

D4,S1, Instrumentation, software and methods

27 A novel method for ATLAS FSI alignment based on rapid, direct phase monitoring

Frequency Scanning Interferometry is a precise, multiple distance measurement technique, originally developed for ATLAS, which is suited to a variety of applications in the survey and alignment of future accelerators and particle detectors. The ATLAS inner detector is instrumented with an automated FSI alignment system, capable of simultaneously measuring hundreds of interferometers within the operational particle tracker. The alignment system began data taking in 2008 and we present the latest results from the on-detector system during LHC running. A new method has been developed based on rapid, direct monitoring of the interferometer phase, which allows the measurement of short term motions with improved precision, at a fraction of the wavelength of light (typically sensitive to < 50nm). We outline the theory behind this novel technique and demonstrate precise measurements from ATLAS, which reveal interesting micron-level movements of the inner detector, correlated with thermal cycles and magnetic field changes of the detector environment.

Speaker: Dr Zhijun Liang (University of Oxford)

28 FEASIBILITY OF THE CLIC METROLOGICAL REFERENCE NETWORK

The CLIC project has imposed pre-alignment tolerances on the transversal and vertical positions of the components of 10 μm along a 200 m sliding window. This specification has led to the concept of overlapping stretched wires being used as pre-alignment references and as the basis of a metrological reference network. In order to demonstrate the feasibility of this concept, the problem has been broken down in terms of the management of coordinate systems. This requires the systematic use of absolute calibrated sensors and CMM measured supports. In addition, a more reliable model of stretched wires has been developed. This paper describes the simulated and experimental results from the 140 m TT1 setup and the simulations extrapolated along the 50 km CLIC metrological reference network.

Speaker: Mr Thomas Touze (CERN)

29 BINP Hydrostatic Level Sensors

Tasks of slow ground motion studies and high accuracy alignment of large accelerator machine components are actual at any time. Hydrostatic level sensors are one of the well-known tool widely used for these problems. Since 2000 year BINP takes part in collaboration with FNAL and SLAC for the purpose of developing and manufacture of hydrostatic level sensors. For these years some modifications of capacitive and ultrasonic hydrostatic level sensors have been developed. The review of the modifications will be presented.

Speaker: Andrey Chupyra (Budker Institute of Nuclear Physics)

30 Methods to Obtain the Horizontal Datum Plane for CSRm 3D Control Network

Some methods to obtain the horizontal datum plane for CSRm 3D control network have been introduced and the character of each method has been analyzed also. The method of combine the level functions of laser tracker and digital level is considered the better one to obtain the precision horizontal plane for control network. In order to obtain the precision horizontal datum plane, the influence to height due to the curvature of geodetic level must be considered when using the digital level to measure the height of benchmarks and therefore the datum obtained by digital level must be corrected during the data processing.

Speaker: Prof. Kaidi Man (Institute of Modern Physics, Chinese Academy of Sciences)

10:20 coffee break

D4, S2, Long Term Monitoring, Ground Motion, Vibration

31 Instrument tests with the new Leica AT401

In order to evaluate the performance of the Leica Absolute Tracker AT401 we performed a series of measurements in our underground calibration facility at sector 10 of the SLAC accelerator. The first was a check of the horizontal angle measurement accuracy and the level to gravity feature. The second was to compare the Laser Tracker distance measurements to our interferometer on a 30 m long horizontal bench with different instrument settings. A third test investigated the stability of the distance offset of the instrument. In addition we give a short summary how the instrument performed in the field for various tasks common in accelerator alignment.

Speaker: Mr Georg Gassner (SLAC National Accelerator Laboratory)

Paper IWAA2010_-_Instrument_tests_with_the_new_Leica_AT401_final.docx IWAA2010_-_Instrument_tests_with_the_new_Leica_AT401_final.pdf

32 Camera Choices for Photogrammetric Surveys

This paper compares the three cameras currently available for photogrammetric surveys in the Metrology Department at SLAC. All of them: Nikon D200, Nikon D300 GSI-modified and Alpa12 metric with Phase One Achromatic Plus digital back were tested on a calibration wall using the Australis software. The first part of the paper summarizes these repeatability studies. The second part introduces the possible mechanical modifications to each of them and concludes with recommendations for specific applications.

Speaker: Catherine Le Cocq (SLAC)

33 Some Design Considerations for the ESRF Upgrade Program Experimental Hall Slab

In 2008, the Council of the European Synchrotron Radiation Facility (ESRF) launched the ESRF Upgrade Programme 2009-2018, an ambitious ten-year project serving a community of more than 10,000 scientists. Funding for the first phase of the Upgrade (from 2009 to 2015) has been secured to deliver: - eight new beamlines with capabilities unique in the world; - refurbishment of many existing beamlines to maintain them at world-class level; - continued world leadership for X-ray beam availability, stability and brilliance; and, - major new developments in synchrotron radiation instrumentation. One of the key elements of the Upgrade Program is to produce nano-sized beams. This will require the construction 120 m and in some cases even 250 m long beamlines. A combination of extended experimental hall and satellite buildings will address this need. One particularly important consideration is the design of the concrete slab that will host these new beamlines. The vibrational stability of the experimental hall slab is a key aspect to in the slab design. However, recent hydrostatic levelling system (HLS) measurements indicate that slab bending movements driven by temperature gradient variations through the slab could be an equally important consideration in beamline stability and performance. This paper will present the measurements and simulations that have led to this conclusion.

Speaker: Dr David Martin (ESRF)

34 Long-term Variation of the Magnet Alignment of SPring-8 Storage Ring

The operation of the SPring-8 was started in July 1997. From thence, the observations of the variations of magnet alignment are executed at regular periods. This paper concludes twelve years measurements. It is verified that the alignment of the magnets is very stable and the deteriorations were small. And, the deteriorations become estimated after several year observations. Meanwhile, for large scale survey of accelerator, there always is measurement bias because of measurement error. The biases make it difficult to compare individual measurements. Attempt was made to take away the bias from measurement by means of average and extract magnet deviations.

Speaker: C. Zhang (Japan Synchrotron Radiation Research Institute)

35 time for discussion

12:30 lunch

D4, S3, Long Term Monitoring, Ground Motion, Vibration // Poster Presentation

36 Vibration issues for SuperKEKB

The KEKB B-Factory will be upgraded to SuperKEKB using the same tunnel as KEKB. The SuperKEKB design peak luminosity is 40 times higher than the world record luminosity which KEKB has achieved. The upgrade is based on the “Nano-Beam” scheme, wherein the beam size is reduced to less than 100 nanometers in the vertical direction at the interaction point (IP). Vibration in the tunnel, especially at the IP, could be a critical issue which may result in luminosity degradation. Vibration measurements made at several locations including the present KEKB tunnel, the BELLE detector, and the final focus quadruple magnets will be reported.

Speaker: Dr Mika Masuzawa (KEK)

Paper proceedings pdf file

37 Initial deformation of the PETRA III slab

The concrete slab of the PETRA III experimental hall has a size of roughly 300x30m and a thickness of 2m. Movements due to temperature variations and setting of the concrete are discussed. Methods of predicting future movements are developed.

Speaker: Markus Schloesser (DESY)

Paper paper_p3-slab_iwaa2010.pdf

38 Presentations of Posters max. 2 min each speaker

Presentations of Posters max. 2 min each speaker

15:10 coffee break

D4, S4, Poster and Vendor Display

39 Adjustment with Least Squares method

Speaker: Ms Petra Radomi (DESY)

Paper adjustment_paper.pdf

Poster adjustment_poster.pdf

40 Alignment concept of HLS-II

The light source at National Synchrotron Radiation Laboratory(NSRL), University of Science and Technology of China (USTC), Hefei, Anhui province, China, is called Hefei Light Source which is called HLS for short (which is different from the meaning of Hydrostatic Levelling System here). Hefei Light Source was initially built from 1984 to 1992. Now, as plan from 2010 to 2012, Hefei Light Source has been updated, the old machine will wrecked and removed and a new machine with full energy injection model will be built in the original buildings. This project is called HLS-II. In this paper the alignment concept of HLS-II will be introduced. How to arrange the layout of the surveying network? How to transfer the reference points? And what instuments are needed? All of these problems are discussed here.

Speaker: Dr Xiaoye He (National Synchrotron Radiation Laboratory, University of Science and Technology of China)

41 An Object Oriented Approach to Processing Accelerator Alignment Measurements

Over a long period of time the least squares compensation program at CERN, LGC, has been gradually re-written in C++. Part of the program has been integrated into a software library, which is also used in a number of other programs, with the functionality specific to LGC built on top. The geodetic transformations used within the program have been updated and a sparse matrix representation added for the least squares matrix, this latter change contributing, in part, to a significant increase in the calculation speed. A new version is now nearing completion, with a necessary change to the input data format allowing for the inclusion of measurements from a non-levelled theodolite or laser tracker. The observation equations used within the program have also been revised where appropriate, to increase the programs flexibility, and these new formulations have added unknown lines and planes to the parameters to be determined. Some of these new observation equations will be presented, together with the anticipated advantages they provide.

Speaker: Mr Mark Jones (CERN)

42 Integration of Laser Scans into a GIS

The integration of laser scans into a Geographic Information System (GIS) is presented. Examples include detailed scans of the Beam Transport Hall (BTH) in SLAC's Linac Coherent Light Source (LCLS). These scans were made at various density levels and portions were subsequently added to an evolving GIS for the Metrology Department. This poster highlights various results of this integration and illustrates the usefulness of utilizing laser scans for adding and verifying features in a GIS.

Speaker: Catherine Le Cocq (SLAC)

Poster IWAA2010_BCF.pdf

43 Performance Test of FARO Laser Trackers

Results on performance test of laser trackers of FARO are presented. Test was performed on the following items. (1) Drift of output after power on, (2) long term variation of output, (3) reproducibility of point measurements, and (4) comparison between measurement with a laser tracker and the one with a stretched wire.

Speaker: Mika Masuzawa (KEK)

44 Photogrammetric Approach to Monitor the Radiation Safety System at APS*

One of the many responsibilities of the Survey and Alignment team at the Advanced Photon Source (APS) is the periodic monitoring of the positional stability of the Radiation Safety System (RSS). The RSS for all operational experiment x-ray beamlines consist of approximately one thousand RSS components. Access to these components is limited to a brief maintenance period, and the use of traditional survey techniques and optical tooling are very time consuming. The APS Survey and Alignment team is currently testing the suitability of close range industrial photogrammetry for this application. The automated photogrammetric system, testing procedures, and results of these tests are discussed in this poster.

Speaker: Jaromir Penicka (Argonne National Laboratory)

45 SLAC - Status Report

This poster presents the major survey and alignment activities at the SLAC National Accelerator Laboratory since 2008. The major project during the last two years has been the construction of the Linac Coherent Light Source (LCLS) with the development of beam lines still ongoing. Besides the LCLS project a variety of smaller projects are under way. This poster will give a brief overview of the various projects and the actual implementations in the field.

Speaker: Mr Georg Gassner (SLAC National Accelerator Laboratory)

Poster slac_status_report_v2.pdf

46 Status of Accelerator Alignment at MSU-NSCL/FRIB

Michigan State University is presently installing a reaccelerator project at the National Superconducting Cyclotron Laboratory(NSCL) and planning the Facility for Rare Isotope Beams (FRIB). The status of alignment activities for the two projects will be shown.

Speaker: Dr David Sanderson (Michigan State University)

47 Status Report on Survey and Alignment Acitivities at FNAL

Survey and alignment activities at Fermilab since 2008 will be presented with an eye towards future projects and challenges as we approach the post-Tevatron era.

Speaker: Richard Ford (FNAL)

48 Status report on Survey and Alignment Concept for the SPIRAL2 accelerator

The SPIRAL2 project located at the Grand Accélérateur National d’Ions Lourds (GANIL facility - Caen, France) has been studied since the beginning of 2001, and is now under construction. This project aims at delivering rare (radioactive) isotope beams with intensities not yet available with presently running machines. An important aspect of this project is that it is foreseen to deliver up to five different beams in parallel to the users. This poster covers the survey and alignment concept for the SPIRAL2 accelerator components. In such a project, the alignment aspects have to be studied very early. To determine the best technique for aligning any equipment, it is essential to know the precision required for the six degrees of freedom, and to understand the reasons for the requested precision. The alignment procedure is taken into account early in the design of the various elements. An object is “located” by its fiducial marks. The high quality of the mechanical connection to these marks is important in the final precision of the object location. This poster will also present instrumentation which will be used for accelerator components alignment.

Speaker: Mr Alexis LEFEVRE (GANIL - CEA/DSM-CNRS/IN2P3)

49 Status Report on the alignment efforts at DESY

Speakers: Mr Martin Noak (DESY), Mr Wolf Benecke (DESY)

50 Straightness evaluation for the KEK electron/positron linac using a level

We adopted straightness measurement using a level for evaluating vertical aligning straightness of the 600-m-long KEK electron/positron linac. It measures tangential angles of the straightness and obtains the straightness by integrating the measured angles without affected by any substantial straightness references. Here, straight bars with length of from 1640 mm to 2306 mm were put on between each center of the neighboring base plates for the linac and slope angles of the bars were measured sequentially by a precise electronic level system (Talyvel 4). The bars were for ensuring continuity of the aligning straightness between the discretely-aligned plates. Pairs of contact feet were adopted under both ends of the bars. They were for preventing plate distortions from affecting the straightness and for avoiding obstacles in measurements. Systematic error caused by offset of the level, distortions of the bars and height differences between the pairs of feet were eliminated by reversal measurement. As a result, straightness with the average reproducibility of 26 micro-m (sigma) for the 71-m-long part of the linac could be obtained. It can be hardly achieved by any conventional methods. The results were compared with the measurements by a telescope-based alignment technique and our laser-based alignment technique. They agreed well with each other. Error estimation based on our error propagating model shows that straightness evaluation with reproducibility of 0.6 mm (2 sigma) for a 500-m-long measurement, sufficient for upgrading the KEK electron/positron linac, and that of better than 1 mm (2 sigma) for a 10-km-long measurement, expected for the ILC project can be achieved.

Speaker: Dr Tatsuya Kume (KEK)

Paper IWAA2010-30-20101012.doc IWAA2010-30-20101012.pdf

51 SURVEY AND ALIGNMENT OF THE ACCELERATOR AT THE NATIONAL CENTER FOR ONCOLOGICAL HADRON THERAPY

The Centro Nazionale Adroterapia Oncologica (CNAO) is the first medical accelerator facility for hadrontherapy with C6+ and protons in Italy. Two ECR ion sources produce a beam injected into a LINAC and accelerated at 7 MeV. A 78m circumference synchrotron stores and accelerates the beam up to 400 MeV/u. Each one of the three treatment rooms receives the beam extracted by the synchrotron; the central one has two beam parts, one horizontal and one vertical; the lateral rooms have an horizontal beam part. The beam path from sources to patient is rather long and many components contribute to the beam formation and characteristic. All these components need to be accurately aligned in a definite position in order to accomplish their task. This paper shows the alignment method, survey instruments and software used for both diagnostic devices and magnets.

Speaker: Mr Davide Bianculli (FONDAZIONE CNAO (ITALY))

52 Survey monument preparation for SuperKEKB

A new set of monuments was installed for the SuperKEKB project. SuperKEKB is a next-generation B-factory which uses the same tunnel as KEKB. Many magnets will be replaced or relocated for SuperKEKB in order to realize collisions with extremely small beams. Placing survey monuments in the accelerator tunnel, which was built three decades ago, was not an easy task for many reasons, as will be discussed in this report.

Speaker: Yasunobu Ohsawa (KEK)

53 Synchrotron ALBA: Ready for Commissioning

ALBA, a third generation synchrotron light facility built in Barcelona is now almost ready for commissioning. Mechanical installation is now completed and the 100 MeV LINAC as well as the 3 GeV booster injector have already been commissioned. The survey and alignment strategy presented during previous workshops has been implemented and allowed us to fulfill all physicist requirements optimizing cost, manpower and alignment procedures. The big effort done with the contractors during the design phase of the initial seven beamlines bore fruit and gave us a valuable efficiency during the installation and alignment phase of the mirrors , crystals and other experimental components. During the past tow years we were also able to track the movements and general behavior of our slab. The first results will be presented.

Speaker: Mr Fabien Rey (CELLS)

54 VALIDATION OF AN OPTICAL WPS SYSTEM

For the Compact Linear Collider (CLIC) project an active pre-alignment system is planned to be used with thousands of wire position sensors (WPS). The capacitive WPS technology used at CERN is rather expensive and limited to the use of conductive reference wires. Alternative sensor and wire solutions are studied. Open Source Instruments Inc is developing a CCD camera based WPS. This sensor uses the cameras and electronics of the Brandeis CCD Angle Monitor (BCAM) used in several LHC experiments. Prototypes of this sensor have been tested for its different characteristics, such as resolution, stability, linearity, dynamic range and absolute calibration. A particular focus has been put on the combination of light-weight and strong vectran wire with this optical sensor. In this paper, the sensor design is presented, followed by the results of the tests carried out with sensors and wires. The future developments needed for an off-the-shelf sensor are outlined in the conclusions.

Speaker: Mr Patrick Bestmann (CERN)

Paper IWAA2010_paper_owps.pdf

Organizing Committee Meeting

Friday 17 September

D5, S1, Long Term Monitoring, Ground Motion, Vibration

55 Experience report with the Alignment Diagnostic System

Since 2009 an Alignment Diagnostic System (ADS) has been operating at the undulator of the new Linac Coherent Light Source at SLAC National Laboratory. The undulator spans a distance of 132 meters and is structured into 33 segments. Each segment is equipped with four hydrostatic leveling sensors and three wire position monitors. This report describes the set up and reflects long time experience gained with ADS.

Speaker: Mr Georg Gassner (SLAC National Accelerator Laboratory)

Paper IWAA_2010_-_Experience_report_with_the_Alignment_Diagnostic_System_final.docx IWAA_2010_-_Experience_report_with_the_Alignment_Diagnostic_System_final.pdf

56 Hydrostatic Level Systems at Fermilab and DUSEL

There are a variety of Hydrostatic Level Systems in use at Fermilab and the Deep Underground Science and Engineering Laboratory (DUSEL) at the Homestake gold mine in Lead South Dakota. Systems at Fermilab are used to measure motion of quadrupole magnets in the Tevatron and the low beta quadrupoles at the interaction regions. In addition there are deep HLS systems to study slow ground motion in preparation for future accelerators. Two types of HLS have been installed on the 2000 ft level at DUSEL to study the motion of the ground during the dewatering process. Data will be presented on slow ground motion, the ATL law as measured by these systems and data on the stability of the measurement systems themselves.

Speaker: Dr James Volk (Fermi National Accelerator Lab)

57 The vibrational characterization of the ALBA Synchrotron Light Source experimental area slab

The vibrational response of the experimental area is one of the major importance on 3rd generation synchrotron light sources. A detailed study of the ALBA experimental area vibrational response has been carried out. The objective of the study is the characterization of the response of the experimental floor area in function of the frequency and value of the excitation and distance to the source. In the present paper the methodology applied, instrumentation and the results are presented in detail. First results on the topological evolution of the slab, based on survey and alignment techniques are also presented.

Speaker: Mr Lluis Miralles (ALBA/CELLS)

58 time for discussion

10:20 coffee break

D5,S2, Various

59 Latest Results from the CLIC Geodetic Studies

The alignment challenge presented by the CLIC project require us to look closely at the gravity field and our ability to model the geoid and the influence of tidal and other non-periodic effects. This is of particular importance if we wish to use HLS in the alignment system, and may have a bearing on the use of other instruments too. To examine how the gravity field can directly affect an accelerator's alignment two research projects are currenly underway. The first is a study of the tidal (and other) effects on measurements made with an HLS. Many factors could affect the alignment of an accelerator over a length of several hundred metres, but we are only interested in those which can produce significant local deformations. An analysis of the contributing factors has been made, different approaches have been considered and tried, and the results to date will be presented. The second study is to determine the geoidal undulations along a straight line as accurately as possible, and to understand if significant local undulations are even possible. The geoid determination is centered around the use a high precision astro-geodetic camera, coupled with gravimetric measurements at the surface and in a tunnel ~100 m directly below. The first measurement campaign has been completed and the preliminary results will be presented.

Speaker: Mr Mark Jones (CERN)

60 A GIS sight on the European XFEL

Planning large facilities like the European XFEL needs the help of various tools like request management systems (RMS), engineering data management systems (EDMS), CAD systems, project management systems and mostly for geodetic purposes also geographic information systems (GIS). Each of these systems gives another sight on the project. This paper shows how the European XFEL looks in a GIS and how these data can help the involved working groups during the planning process.

Speaker: Mr Gerhard Neubauer (DESY)

61 Graphical and Numeric Measurement Station Uncertainty Characterization

Understanding and communicating reliable measurement uncertainty is an important responsibility of advanced particle accelerator alignment. In many cases the measurement process uncertainty is difficult to control in accelerator alignment due to geometry constraints within the accelerator facility. Methods to characterize and communicate specific influences and dependences are key tools for the alignment teams. While point uncertainties are the primary output of interest, understanding instrument/station uncertainty (Ux, Uy, Uz, URx, URy, URz, and TotalAngularU) is a key element to influence and control the alignment network uncertainty. Objectively characterizing and visualizing each instrument stations position and orientation uncertainty in context of the network is helpful. Understanding the influences and dependence that station position and its observation precision plays in network uncertainty enables alignment teams to make objective choices on how to effectively optimize station performance and position(s). The capability can both improve performance and reduce alignment uncertainty. Several cases studies are presented showing how Ux, Uy, Uz, URx, URy, URz, and TotalAngularU station uncertainty plays a direct role in network uncertainty. Individual station uncertainty within the network results are presented both graphically and numerically. The evaluation and graphical results show the net differences in how the measurement network from a station influences component alignment characterization. The outcome demonstrates how choices in which sensors are used and how their position(s) within the network influence alignment fidelity.

Speaker: Mr Scott Sandwith (New River Kinematics)

D5, S3, Closing Session

12:30 lunch